21233455693 has 4 divisors (see below), whose sum is σ = 21262189120. Its totient is φ = 21204722268.

The previous prime is 21233455687. The next prime is 21233455723. The reversal of 21233455693 is 39655433212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21233455693 - 2⁹ = 21233455181 is a prime.

It is a super-2 number, since 2×21233455693² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233455093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14365605 + ... + 14367082.

It is an arithmetic number, because the mean of its divisors is an integer number (5315547280).

Almost surely, 2^21233455693 is an apocalyptic number.

It is an amenable number.

21233455693 is a deficient number, since it is larger than the sum of its proper divisors (28733427).

21233455693 is an equidigital number, since it uses as much as digits as its factorization.

21233455693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28733426.

The product of its digits is 583200, while the sum is 43.

The spelling of 21233455693 in words is "twenty-one billion, two hundred thirty-three million, four hundred fifty-five thousand, six hundred ninety-three".